How do you know if your alternator is going out if it's still charging your battery?
Thursday, February 18th, 2016 AT 5:02 PM
3 Replies
CATAFINA
MECHANIC
167 POSTS
Read the battery voltage before you start the car then read it again while engine is running it should read within 2 volts if not there's a problem.
For example its 12.5 before you start the car and it reads 14.5 while running-the alternator is doing its job
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Thursday, February 18th, 2016 AT 6:25 PM
CJ MEDEVAC
MECHANIC
11,004 POSTS
CATAFINA IS SPEAKING "ELECTRICALLY"
IF IT'S SQUEALING OR MAKING A GRINDING SOUND, "MECHANICALLY", THE BEARINGS OR BUSHINGS INSIDE MAY BE WORN OUT OR FAILING.
THE MEDIC
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Thursday, February 18th, 2016 AT 7:18 PM
KEN L
MASTER CERTIFIED MECHANIC
47,643 POSTS
Also if a diode is going out the alternator will change the battery with AC voltage which is bad, here is more information on how to test it correctly.